You're encountering a common configuration nuance. While not a bug, the campaign discount applying to unlinked items likely means your Sales Price or Sales Line Discount setup for that campaign is too broad.
To fix: Check your Sales Prices
and Sales Line Discounts
filtered by the Campaign Code. Adjust any entries that apply the discount to "All Items" or broad item groups to be more specific. This will ensure discounts only apply to intended campaign items.
Hope this helps!
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